Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ebdecf1d94b771…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 08:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d2813c837500049a0c7e14f5179576b7 SHA-1: 5e2ca29a2c1bbb9365267e6bceb8c48ea527145f SHA-256: d5ebdecf1d94b771721074eb3cd3c19a9d0ffa4d307000ee8eee5f25a595c42d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=find+someone+who+loves+you+at+your+worst PDF link annotation
    • http://vekvelo.ru/zipegeoxu7y.pdfIn PDF document text
    • http://gefejisu.22web.org/free_sheet_music_for_piano_christian_hymns.pdfIn PDF document text
    • http://biomaniix.website/gowonazixejowiwiwasix52aua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fd8fc3feed3c.pdfIn PDF document text
    • http://gafujovinotu.22web.org/85638269244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6017db832a611.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/vehicular_accident_report_sample_letter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fcaaca4a6cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff2220333d59.pdfIn PDF document text
    • http://romeita.fun/48942447448lecgb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rorives/facebook_appear_offline_android.pdfIn PDF document text
    • http://tuwafexom.epizy.com/25713675070.pdfIn PDF document text
    • http://lesexuxu.rf.gd/redhat_6_iso_image_free.pdfIn PDF document text
    • http://memoleroxaden.rf.gd/18377299905.pdfIn PDF document text
    • http://sugomoriwegisi.epizy.com/vadabefotawitovikeki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5276 bytes
SHA-256: a787ac114cf9beb5ba0ae7f15733f68bc7183120ef426666df1f5e38607f8253
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 11064 bytes
SHA-256: a3409b47e2f0595ac39d065c46b5ab13b9e42b816a6aef3f931143faa3164b68

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